LED Tube of low-voltage driving chip requirements
1, the driving chip nominal input voltage range shall satisfy the DC 8~40V, to cover wider need. Voltage capacity should be greater than 45V. When the input is AC 12V or 24V, a bridge rectifier output voltage will simply with the voltage fluctuations, especially when the voltage is too high, the output DC voltage will be higher. If the drive IC does not have a wide input voltage range, often in the grid voltage increases will be breakdown, whichburned LED tube light source.
2, the driving chip nominal output current is greater than 1.2~1.5A. LED light source for lighting, the nominal operating current LED 1W power sourceis 350mA, the nominal operating current LED 3W power source for 700mA. Need high-power LED tube light source more current, thus driving the ICLED lighting lamps selected must have enough current output, product design must also make driving IC working at full load output 70~90% optimal working zone. The use of full load output current drive IC in narrow space, poor heat dissipation lamp lamp, easily lead to fatigue and early failure.
The output current of 3, driver must remain constant, so that LED can stably, no flicker. The same driver chip used in the same conditions, the size of the output current should be as consistent as possible, which is discrete is smaller, so the production in large batch automatic production line toensure the effective and orderly. There are certain discrete driver for output current, required classified selection in the factory or put into the production line, adjust the PCB plate current setting resistor size, LED lamp made of constant current driving plate brightness of similar LED light source, in order to maintain the consistency of the final product.
4, the drive chip packaging should be conducive to the rapid cooling drive chip die, as will directly bound to die on the copper plate, and a pinextending to the package, heat quickly in the PCB copper foil soldered directly to. If long time by 300~1000mA current in 4X4mm chip, is bound to produce power and heating, therefore, the physical structure of the chip itself is also very important.
5, the driver chip EMI, anti noise and high pressure resistant ability is also related to the entire LED lighting products can be smoothly through theCE, UL certification, so it is necessary to choose a topological structure of advanced and high production technology in the design of driving chip.
6, the driver chip power consumption less than 0.5W, the switch frequency requirements of more than 120Hz, so as to avoid the interferenceproduced visible flicker.
In conclusion, LED green lighting LED driver chip to develop innovative design. LED lighting cannot do without the driver chip, so need to functionLED drive IC. If the LED lamp using AC power below 36V, can consider the non isolated power supply; if the choice of 220V and 100V AC power,you should consider the isolated power supply. Driver IC AC 100~220V directly, because the volume of applications demanding requirement intechnology, there are higher requirements, more difficult, so many countries in the world are trying to develop in.
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